JPH0724169B2 - Discharge electrode of lightning arrester device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is capable of promptly discharging an abnormally large current due to a lightning strike to the ground by a lightning protection function, and
The present invention relates to a discharge electrode of a lightning arrester device capable of suppressing and interrupting a follow current to prevent a permanent ground fault.

(Prior Art) Conventionally, as a lightning arrester device for a transmission line, as shown in FIG. 6, a suspension insulator string 6 is attached to a tip portion of a support arm 1 of a steel tower.
The transmission line 9 is supported via the, and the lightning protection insulator 14 is suspended and fixed to the upper horn mounting bracket 4 via the mounting bracket 13.
A horn-shaped ground-side discharge electrode attached to its lower end
30 and the horn-shaped discharge electrode 31 on the charging side, which is attached to the lower horn mounting member 7, are opposed to each other with a predetermined discharge gap G. Further, as shown in FIG. 7, when the power transmission line 9 swings in the line orthogonal direction P (direction orthogonal to the paper surface of FIG. 6), the discharge gap G is substantially formed at the tip of the discharge electrode 31. The discharge part 31a having a rod shape was fixed to the T-shape so as to be constant, and both ends thereof were cut ends.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional transmission line lightning arrester device, since the rod-shaped discharge part 31a is fixed to the tip of the discharge electrode 31 on the charging side, There was a problem that electric field concentration occurred at the cut ends of 31a, resulting in radio interference due to corona.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention arranges a discharge electrode on the ground side and a discharge electrode on the charging side so as to be relatively movable with a discharge gap therebetween. In the transmission line arrester device described above, the discharge electrode on the charging side is formed into a substantially linear shape by bending a main body made of a single wire and directing it in the middle of the main body in the same direction as the relative movement direction. A wide discharge part having a smooth and smooth surface is formed, and the discharge part is arranged so as to be located directly above the power transmission line.

(Operation) The present invention operates as follows by adopting the above means.

When the power transmission line oscillates in the direction orthogonal to the line due to wind pressure or the like, the discharge electrode on the charging side and the discharge electrode on the ground side move relative to each other, but at this time, the discharge part of the discharge electrode has a wide linear shape. Therefore, the discharge gap between both discharge electrodes is kept substantially constant, the electrical reliability is improved, and both ends of the discharge part are arranged so as not to be cut ends and to be located directly above after power transmission. Therefore, the electric field concentration at both ends of the discharge part is relaxed, and the radio interference due to the corona is suppressed.

(Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3.

A connecting fitting 2 is fixed to the tip of a supporting arm 1 of a steel tower, and a suspending insulator 5 is connected to the connecting fitting 2 via a U-clevis link 3 and a horn mounting fitting 4 in series as a supporting insulator. The insulator string 6 is swingably supported in the line direction and the orthogonal direction. In this embodiment, the connecting fitting 2, the U-clevis link 3 and the horn mounting fitting 4 constitute an upper hanging fitting. A transmission line 9 is connected to the horn mounting bracket 7 at the lower end of the suspension insulator string 6 via a connecting link 8.
An electric wire clamp 10 for supporting the electric wire is supported. In this embodiment, the horn mounting member 7, the connecting link 8 and the wire clamp 10 form a lower hanging member. The horn mounting brackets 4 and 7 are equipped with arcing horns 11 and 12 for reducing damage to the surface flashover of the suspension insulator string 6 as much as possible.

A mounting bracket 13 is horizontally fixed to the tip of the support arm 1 by bolts, and a lightning arrester 14 is fixed to the lower surface of the tip of the bracket 13 by a bolt 16 with an electrode fitting 15 on the ground side thereof. . In addition, a horn-shaped ground-side discharge electrode 18 is supported by the lower end portion of the lightning protection insulator 14, that is, by the electrode metal fitting 17 on the charging side.

On the other hand, as shown in FIG. 2, the discharge electrode 19 on the charging side is almost cantilever-supported by the bolt 28 in the horn mounting member 7 between the discharge electrode 19 and the discharge electrode 18, as shown in FIG. A predetermined air discharge gap G is provided. The discharge electrode
As shown in FIG. 2, the tip of 18 is formed in a substantially arcuate shape when viewed from the direction orthogonal to the line, so that the discharge gap G can be maintained substantially constant even if the suspension insulator string 6 swings in the line direction. I have to. Further, the discharge electrode 19 is formed by bending a body portion 19b of a round wire into an elongated rectangular frame shape when viewed from a plane, and forming a wide and linear discharge portion 19a located at the tip of the discharge electrode 19 in the middle of the body portion 19b. When the power transmission line 9 is swung in the direction orthogonal to the line (see the arrow P in FIG. 3) about the hanging point of the connecting fitting 2, the discharge gap G between the discharge electrodes 18 and 19 is kept constant. It is arranged so as to be directly above the power transmission line 9.

The lightning protection insulator 14 is a voltage-current characteristic whose main material is a pressure-resistant insulating cylinder (not shown) formed in a cylindrical shape by a tension-resistant material such as FRP, and zinc oxide (ZnO) housed in series therein. Is a non-linear current limiting element (not shown), cap-shaped power-supply-side and ground-side electrode metal fittings 17 and 15 fitted and fixed to both ends of the pressure-proof insulating cylinder, and the outer periphery of the pressure-proof insulating cylinder. And a rubber mold 20 provided on the.

It should be noted that the electrode metal fittings 1 on the charging side and the grounding side of the lightning protection insulator 14
7 and 15 are provided with arcing rings 21 and 22 for reducing the damage of the rubber mold 20 when the surface flashes.

On the upper side of the mounting bracket 13, a snow cover gutter 23 is mounted as snow cover control means. Locking plates 24, 25 are formed at both ends of the snow-falling gutter 23, and the locking plate 24 is a bolt 2
It is clamped and fixed to the tilting frame 1A of the support arm 1 by 6, and
The locking plate 25 is tightened and fixed to the tip of the mounting bracket 13 with a bolt 26. Then, the bottom surface of the snow-covered falling gutter 23 is positioned lower toward the tip to form a snow slide slope S,
The snow covered with the snow that has moved from the tilting frame 1A of the support arm 1 is moved to the same tilting surface S
It is arranged so as to move to the tip end portion along and fall to prevent the snow cap from being expelled to the lightning protection insulator 14.

In addition, a snow baffle plate 27 is vertically welded and fixed in the middle of the mounting bracket 13, so that the lightning protection insulator 14 is attached to the mounting bracket 13 from the mounting bracket 13.
I try to drop the snow that is trying to move to the side.
Since this snow is a part of the snow that has not been dropped by the snow-covered fallout gutter 23, the amount thereof is very small, but the support arm 1
Also has a function of preventing the movement of water from the lightning protection insulator 14.

Next, the operation of the transmission line lightning arrester device configured as described above will be described.

Now, when an abnormally large current exceeding the assumption is applied to the transmission line 9 due to a large-scale electric shock, this current is discharged from the wire clamp 10, the discharge electrode 19 to the discharge electrode 18 through the discharge gap G, and the lightning strike from the electrode fitting 17 is performed. It flows to the current limiting element (not shown) in the insulator 14,
It flows from the grounded side electrode fitting 15 through the mounting bracket 13 to the support arm 1, and further flows into the steel tower to be discharged to the ground.
The subsequent current generated thereafter is suppressed and cut off by the current limiting element.

In the embodiment of the present invention, the discharge electrode 19 is formed by bending a round wire into an elongated rectangular frame shape when viewed from the plane, and the discharge portion 19a at the tip is formed in a straight line. When swinging to, the discharge electrode 19 on the charging side and the discharge electrode 18 on the ground side move relative to each other, but since the discharge portion 19a of the discharge electrode 19 is linear at this time, both discharge electrodes 18, The discharge gap G of 19 is kept substantially constant, the electrical reliability is improved, and both ends of the discharge part 19a are cut ends, so that electric field concentration at both ends of the discharge part 19a is mitigated, and radio waves due to corona are generated. The obstacle can be suppressed.

The present invention can also be embodied as follows.

(1) As shown in FIG. 4, the tip discharge part 19a of the discharge electrode 19
Is formed into a triangular shape with rounded corners, or (2) as shown in FIG. 5, the snow for preventing the snow falling on the inclined portion of the discharge electrode 19 from sliding downward. To form the collar 19c integrally. In this case, the movement / accumulation of snow on the horn mounting member 7 is prevented, and the adverse effect of snow on the suspension insulator string 6 is suppressed.

(3) Applicable to distribution lines other than transmission lines. or,
Applies to tension-type lightning arrester devices in addition to suspended lightning arrester devices.

Effects of the Invention As described in detail above, the present invention can alleviate the electric field concentration near the ends of the discharge part of the discharge electrode, and thus can prevent the radio interference due to corona and improve the electrical reliability. effective.

[Brief description of drawings]

FIG. 1 is a perspective view of only a discharge electrode according to the present invention, FIG. 2 is a front view showing the entire lightning arrester device for a transmission line equipped with the discharge electrode of the present invention, and FIG. 3 is a right side view of FIG. , Fig. 4,
FIG. 5 is a perspective view showing another example of the discharge electrode, FIG. 6 is a front view showing a conventional lightning arrester device, and FIG. 7 is a plan view of the discharge electrode. 1 ... Support arm, 6 ... Suspension insulator string as support insulator, 9 ... Transmission line, 13 ... Mounting bracket, 14 ... Lightning arrester, 15 (17) ... Electrode metal fitting on the ground (voltage) side , 18 (1
9) …… Discharge electrode on the grounding side (charge), 19a …… Discharge part, 19
b ... Spherical end.

Claims (2)

[Claims] 1. A transmission line lightning arrester device in which a discharge electrode (18) on the ground side and a discharge electrode (19) on the charging side are opposed to each other with a discharge gap G so that the discharge on the charging side is possible. The electrode (19) has a body portion (19b) made of a single wire, and has a substantially linear and smooth surface in the middle of the body portion (19b) in the same direction as the relative movement direction. A discharge electrode for a static electricity insulator device in which a wide discharge part (19a) is formed and is arranged immediately above the power transmission line (9). 2. The discharge electrode for a lightning arrester device according to claim 1, wherein the discharge electrode (19) is formed of a round wire in a rectangular frame shape.